.demo {
    background-color: red;
    .far {
      border: 1px solid blue;
    }
  }
  
  .imgs {
    width: 200px;
    height: 200px;
    background-size: 100%;
    border: 10px solid pink;
  }
  
  .react {
    background-image: url('../images/react.jpg');
  }
  .vue {
    background-image: url('../images/vue.png');
  }
  